Furnace



(No Model.) j y WQD. BARTLETT.

V FURNAGB. N0."363,97'7. l Patented May 31, 1887.

lhvrrnnf STATES AreNr Frieda.

FURNACE.-

SPECIFICATION forming partof Letters Patent No. 363,977, dated May 31, 1887.

' Application filed August 17, 189.6. Serial No. 211,140. (No mcdcl.)

To @ZZ .inkom it may concern.:

Be it known that I, WILLIAM D. BARTLETT, of Amesbury, county of Essex, and State of Massachusetts, have invented an Improvement l cylinders are erected side by side in a furnacechamber inclosed by brick-work, the two cylinders being connected by a suitable collar, so that the products of combustion lset free in one cylinder after traversing it enter the next cylindery and alsoheat it. The furnacechamber at its lowerend is supplied with air,which, rising in the said chamber about the said cylinder, is heated by radiation from the said cyl inders.

The furnace chamber at or near its upper end has connected to it the hot-airconducting pipes. The products of combustion in A' their passage through the cylinders are* diverted by spreaders toward and againstthe in-.

te'rior walls ofthe cylinders, or are prevented from passing'directlythrough the center of the cylinders inthe path that they would naturally take, and in this way the heatin the products of combustion is absorbed 'in heating the metal cylinders. Theairenteringthefurnaee-chamber, as well asl the atmospheric air admitted to the fire-chamber, as will be described, may be heated before entering the re-chamber by passing through fines in the brick-work, the ilues being of greater or less length.

The invention consists in certain combinations and arrangements of parts, as I will now proceed to particularly describe and claim.

Figure 1 in vertical section shows a furnace embodying my improvements; Fig. 2, a horizontal section of one of my improved furnaces below the dotted line x, Fig. l; and Fig. 3 isa sectional detail in the line w', Fig. 2. I

Referring to the drawings, A B represent two metal cylinders, preferably sheet-steel,put together .by rivets, as in the -manufaeture of boilers.

The cylinder A, constituting the combustionchamber, has at its lower end an ash-pit, A',

' which may be of any usual construction, it being provided with a door having any usual draft-regulating slide.

Above the ash-pit the cylinder is shown as lined with rebrick, as A, to constituteaiirepot,and is providedv with a grate, A3, which in practice may be ofany usual construction, s0 as to be tipped or shaken and overturned when desired,theparticular construction of the grate whereby it may be shaken or overturned not being herein shown, because not of my inven tion.

Thecylinder A has a door, A4, and a throat, A5, of usual construction, whereby coal or other material to be burned may be introduced into the fire-pot. The cylinders A and B are setat a little distance apart ina furnace-chamber, a, surrounded by a brick wall, C, which in turn is again surrounded by a second brick wall, G-, so as to leave an airchamber, d, between them.

. The cylinder B, constituting a heating-chamber, is joined to the cylinder A near its upper end by a short piece of pipe or by a collar,'d, to thus permit the products of combustion to pass from the cylinder Ainto and through the cylinder B and out from the said cylinder by the exit-pipe D, the products of combustion in -their passage vbeing diverted toward the walls of the said cylinders by the spreaders E E E2, supported therein as shown, the said spreaders being located, preferably, to one side of the center of the said cylinders, as shown, in order that the products of combustion may be diverted, as described, outwardly toward and`di rectly against the interior walls of the said cylinders, instead of takinga direct central course through the said cylinders and out into the usual chimney through the exit-pipe D. The spreaders are preferably hollow cones of met-al, and that one (E) suspended in the cylinder A intercepts in its interior the rising products ofV combustion, while the others, E and E2, in the cylinder B receive the descending current on their external surfaces. By this construction and arrangement of the spreaders the tendency to a direct outflow of the products of combustion is most effectually overcome and the heat is thrown against the walls of the cylinders.

The brick-work C (see Fig. 2) is thickened or made wedge-shaped between the two cylin ders, in order to make the furnace-chamber a of substantially equal size or area about the cylinders, and at or near the lower end of the said chamber the brick-work, as herein shown, is provided with duets e e', for the admission of atmospheric air into the chamber a. The ducts e e will preferably be of such area as to admit air in excess of that to be taken from the said chamber by the hot-air pipesf when all are open; but the wall C will for the best results be contracted at and about the -top of the cylinders A B, as shown ata', the area of the space so left being, however, sufiieient to supply all the pipes ff.- rlhe contraction of the furnace-chamber at a causes the heated ai r to be forced upward above the top of the said cylinders.

The irepot is supplied with atmospheric heated air through a pipe, g, extended through the brick-work and the cylinder A at apoint, as herein shown, above the tire-pot, the iutroduction of air by the said pipe affording fresh oxygen to combine with the products of combustion as they are eliminated from the coal, to thus make more complete combustion and more intense heat.

The cylinder B is supported upon feet b, and the furnace-chamber i'loor under itisprovided with a water-chamber, w, supplied as desired or neededl from a pipe, w, having a funnel, to2.

The exit-pipe has a damper, 7L, by which to regulate the passage of the products of combustion vor smoke from the heater, and a register-damper to permit the admission of cold air into the said pipe at one side of the partition h2' to reduce the draft when desired.

These dampers may be of able construction.

I claim- 1 1. In a heater, afire-cham'ber, two cylinders located therein and constituting eolnbustion and heating chambers, respectively, a pipe or collar oonnectin g said chambers near their upper ends, and an outlet-ue connected with the heatingchamber near its bottom, Vcombined with spreader E in the combustion-cylinder and the spreaders E E2, suspended in the said heating-cylinder, the spreaders E and E being arranged eecentrically with relation-to said cylinders, substantially as described.

2. In a heater, the two cylinders A B, connected together at their upper ends, combined with the brick-work C, contracted at and about the top ofthe said cylinders and thickened or made wedge-shaped between thetwo cylinders to form a furnace chamber of substantially equal size or area aboutthe said cylinders, the said briek-work being provided with air-ducts leading into the furnace chamber, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WM. I). BARTLETI. Witnesses:

JOHN HOWELL, CHAs. H. BANKS.

any usual or suit- 

